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Three way Switch installation; One cable has two wires plus a bare copper grounding wire, The other cable has three wires plus a ground.1. Connect the black wire from the two-wire cable to the dark common screw terminal. 2. Connect the red and black wires from the three-wire cable to the traveler screw terminals. 3. Join the white neutral wires together with a wire connector and pigtail the grounding wires to the grounded metal box. 4. When the switch lies at the end of the circuit one cable enters the box. 5. The cable has a black wire, red wire, and white wire, plus a bare copper grounding wire. 6. Connect the black wire to the dark common screw terminal. 7. Connect the white and red wires to the two traveler screw terminals and the bare copper grounding wire to the grounded metal box.I hope this help.

1) You have 2 cables to to the Heat-Vent-LightOne cable is 12-3 and 1 cable is 12-3

2) That's where it's gets fuzzy.What color wires are on HentVentLight?Is power at the ceiling box or at the wall box?What other wires are inside the wall box?What kind of switch are you installing?

3) With that number of wires, it sounds like power is at ceiling box.Power would arrive at ceiling box on one cable that has a Hot-black and Neutral-white wire.

4) Start at wall box:Let's suppose you are installing a wall device that has 3 individual switches, with one switch for each HentVentLight.The Hot wire from ceiling box would drop down into wall box on a black wire, and this wire connects to brass screw on switch.Wire going to heater connects to one of the silver screws.Wire to fan to another silver screwWire to light to another silver screw.

5) Work at ceiling box:Let's suppose your HentVentLight has 4 wires: Black for light, Red for fan, Blue for heater, and White Neutral.The white neutral connects to Neutral wire as described in #3.Black, Red and Blue connect to each of the wires that come up from switch.

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If the power originates at the location of the light (or other item being switched) you need a 3-core cable from there to to each switch location.
If the power originates at one of the switch locations you need a 2-core cable from there to the fixture and a 3-core cable to the other switch location. (If the cable to the second switch location is routed through the junction box at the fixture then you only need 4 cores from the first switch to the junction box--three switch wires and the neutral wire for the fixture.)
In all cases described above the ground (earth) wire is separate and not included in the count.

Wiring a bathroom combination vent, heater, light 3 way switch means more wires. In brief, you need to run two cables - one a two wire and one a three wire from the switch to the fan.

Incoming power will have white black and ground.

The two wire cable for the switch to the fan will have wht, blk, and ground.

The three wire will have red, blk, wht, and grnd.

The switch will likely have 2 blacks and a red coming from it, with two blacks and a red on one side, and a single black on the other.

The fan should have a red, blue, green, black, and white.

On the fan end: Group all green/copper grounds together and use a wire nut to fasten them together. Tape the nut to the wires.There will be five white wires coming through. For ease of handling, using wire nuts, connect two on one nut and three on the other.connect the blue to a blck. Connect one red to one black, and the other red to the other black.

The switch will have one red going into the 3 wire cable, a black going to the 3 wire cable, and a black form incoming power to the side opposite the 3 wires, and a blck going to the two wire cable.